caa a22 4500 445871083 CHVBK 20180317145511.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s11107-010-0296-5 doi (NATIONALLICENCE)springer-10.1007/s11107-010-0296-5 Integrated routing in GMPLS-based IP/WDM networks [Elektronische Daten] [Walter Colitti, Kris Steenhaut, Didier Colle, Mario Pickavet, Jan Lemeire, Ann Nowé] The Internet traffic evolution has forced network operators to migrate toward an integrated infrastructure which brings the IP and optical layers under a unified model. The integration between the two technologies has been facilitated by the development of the Generalized Multi Protocol Label Switching. In the integrated scenario, Multilayer Traffic Engineering can be reinforced with integrated routing techniques. Integrated IP/WDM routing facilitates the routing decision phase by allowing a node to have a complete knowledge of the IP and WDM domains when accommodating traffic. This study focuses on integrated IP/WDM routing. We analyze two basic policies widely discussed in literature: one policy prioritizes the traffic accommodation on the virtual topology, while the other prioritizes the traffic accommodation on the physical topology. We show that both the mechanisms do not lead to efficient resource utilization because they tend to congest one layer more than the other one. We propose an adaptive heuristic which combines the advantages of both the policies. When accommodating traffic, the proposed approach selects the appropriate layer depending on the resource utilization being experienced in the virtual and the physical topologies. We demonstrate via simulations that the cross-layer resource optimization executed by the proposed scheme achieves significant improvements in terms of blocking ratio. Springer Science+Business Media, LLC, 2010 GMPLS nationallicence Integrated IP/WDM routing nationallicence Cross-layer resource optimization nationallicence Colitti Walter ETRO Department, Vrije Universiteit Brussel (VUB), Brussel, Belgium aut Steenhaut Kris ETRO Department, Vrije Universiteit Brussel (VUB), Brussel, Belgium aut Colle Didier Department of Information Technology—IBBT, Ghent University, Ghent, Belgium aut Pickavet Mario Department of Information Technology—IBBT, Ghent University, Ghent, Belgium aut Lemeire Jan ETRO Department, Vrije Universiteit Brussel (VUB), Brussel, Belgium aut Nowé Ann ETRO Department, Vrije Universiteit Brussel (VUB), Brussel, Belgium aut Photonic Network Communications Springer US; http://www.springer-ny.com 21/3(2011-06-01), 238-252 1387-974X 21:3<238 2011 21 11107 https://doi.org/10.1007/s11107-010-0296-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11107-010-0296-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Colitti Walter ETRO Department, Vrije Universiteit Brussel (VUB), Brussel, Belgium aut NATIONALLICENCE 700 1- Steenhaut Kris ETRO Department, Vrije Universiteit Brussel (VUB), Brussel, Belgium aut NATIONALLICENCE 700 1- Colle Didier Department of Information Technology—IBBT, Ghent University, Ghent, Belgium aut NATIONALLICENCE 700 1- Pickavet Mario Department of Information Technology—IBBT, Ghent University, Ghent, Belgium aut NATIONALLICENCE 700 1- Lemeire Jan ETRO Department, Vrije Universiteit Brussel (VUB), Brussel, Belgium aut NATIONALLICENCE 700 1- Nowé Ann ETRO Department, Vrije Universiteit Brussel (VUB), Brussel, Belgium aut NATIONALLICENCE 773 0- Photonic Network Communications Springer US; http://www.springer-ny.com 21/3(2011-06-01), 238-252 1387-974X 21:3<238 2011 21 11107 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer